Improvement in relief apparatus for air-compressors



- W. F. 'TALLMAN. RELIEF APARATUs FOR AIR COMPRESSORS. No. 176,096.Patented April 11, 1876.

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N-PETERS, PHOTDJJTIIOGRAPHER, WASHINGTON, D C.

UNITED STATES WILLIAM F. TALLMAN, OF MINEVILLE, NEW YORK.

IMPROVEMENT IN RELIEF APPARATUS FOR AlR-COMPRESSORS.

Specification forming part of Letters Patent No.

176,096. dated April 11, 1876; application filed February 21, 1876.

To all whom it may concern.-

Be it known that I, WM. F. TALLMAN, of

Mineville, in the county of Essex and State of New York, have invented anew and Iin' proved Relief Apparatus for Air Compressors, of which thefollowing is a specification:

My invention consists of a weighted valve, in connection with thecylinder of an air-compressor, to be raised by the air when the pressureexceeds a certain-limit, and a piston to which the air is admitted bysaid valve, and raised so as to stop the action of the receiving-valvesof the compressor, with which it is connected for that purpose, and thusprevent the increase of the pressure unduly. The weighted valve fallswhen the pressure of air diminishes and opens an escape for the air fromthe piston, which then falls and allows the valves of the compressor toact again. The relief apparatus may be made to Work special valves onthe compressor instead of the receiving-valves.

Figure 1 is a side elevation of an air-compressor with my improvedattachment, and Fig. 2 is a section of the attachment.

Similar letters of reference indicate corresponding parts.

A represents the cylinder of the air-compressor, and B thereceiving-valve of the same. 0 is a weighted valve, which I arrange inthe top of the pipe D, and E is a piston in a cylinder,

F, connected with G by a small passage, G, so that when the air-pressureexceeds the desired limit the valve 0 will rise and admit air underpiston E. The rod of the piston is connected, by the spring, cross-barH, rods I, to hellcranks K and the bars M, so that when it rises itholds the receiving valves so that they neither receive nor dischargeair unt-il the air-pressure falls below the pressure required, when thevalve 0 willfall and allow the air to escape from under piston E, whichwill descend and let the receiving-valves act again. The rod of piston Emay be connected with the receiving-valves by any other appliedarrangement of apparatus, and the piston may be made to open anothervalve instead of the receiving-valves.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-- The weighted valve 0 and piston E,combined with the receiving valves or other valve of an air-compressor,A, substantially in the manner described, for regulating the pressure,as specified.

WILLIAM FOUVEL TALLMAN.

Witnesses:

WM. El. CARR, JOHN W. CARR,

E. B. SPRAGUE.

